Lucent Technologies MERLIN LEGEND Release 5.0 System Planning Manual page 234

MERLIN LEGEND Communications System Release 5.0
System Planning 555-650-112
5 Data Communications
Assigning Lines/Trunks to Data and Video Stations
Ground-start/loop-start lines/trunks connect to ground-start/loop-start jacks on the
following types of modules in the control unit:
Analog/Digital Tie. This trunk type "ties" two telephone switching systems
together, providing access to all telephones or data equipment on each
system. Analog Tie trunks are used for data communication with modem
data stations connected to a system at a different location, such as a
different floor of a building, a different building, or a different city or state.
Analog Tie trunks connect to a jack on a 400EM module in the control unit.
Video calls are not made over analog Tie lines/trunks.
Digital Tie trunks are used for digital data communications, such as G4
FAX and videoconferencing, with digital data/video stations connected to a
system at a different location, such as a different floor of a building, a
different building, or a different city or state. Digital Tie trunks are emulated
by T1 facilities connected to a 100D module in the control unit. Video and
digital data calls may be made over digital Tie lines/trunks.
Direct Inward Dial (DID). Incoming calls reach specific individuals or
facilities in the system without the help of a system operator. DID trunks
are available only in Hybrid/PBX mode. A DID trunk is used to receive
incoming calls from outside modem data stations. It is not used for
outgoing calls. A DID trunk connects to a jack on an 800 DID module in the
control unit. Video calls are not made over DID lines/trunks.
DS1 (Digital Signal 1). This facility carries digital signals in the DS1 format.
A DS1 facility can be used for communication with outside digital or modem
data stations, including video systems. A DS1 facility connects to the jack
on a 100D module in the control unit. Even though there is only one
physical jack, the 100D module supports up to 24 logical endpoints for
voice and data calls; each DS0 channel in the DS1 signal corresponds to a
trunk or logical ID.
— 800 GS/LS
— 400 GS/LS/TTR
— 408 (LS lines/trunks only)
— 408 GS/LS
— 400 (LS lines/trunks only)
— 800 (LS lines/trunks only)
— 408 GS/LS-MLX
— 800 GS/LS-ID
Issue 1
June 1997
Page 5-28